.article-detail{
  width: 100%;
  max-width: 980px;
  min-height: 100%;
  box-sizing: border-box;
  padding: 15px;
  margin: 0 auto;
  box-shadow: 0px 0px 4px #ccc; 

  pre {
    box-shadow: 0 0 10px #ccc;
    background: #f6f8fa;
    padding: 15px;
  }
  img {
    max-width: 100%;
  }
  
}